METHOD AND APPARATUS FOR IMPROVING STABILITY AND DYNAMIC RESPONSE OF HALF- BRIDGE CONVERTER OF A SWITCH POWER SUPPLY
Typically, in a half-bridge converter A DC blocking capacitor and inductance on the primary side combines with the inductor and capacitor on the secondary side to produce complicated converter dynamic characteristics that make converter stabilization difficult. The disclosed system and methods enable converter stabilization by modulating, as a function of the voltage across the DC blocking capacitor, the feedback output error signal or the ramp signal for the PWM controller of the converter. The modulation removes the effect of the resonant circuit formed by the primary inductance and the DC blocking capacitor in the output voltage regulation loop. Further adjustment of the duty cycle of the power switches enables keeping the output voltage undisturbed by voltage variation across the DC blocking capacitor. Since, this inner compensation loop results in the voltage regulation feedback loop respond to only the output inductor-capacitor filter, the transfer function of this loop displays second order characteristics from the fourth order. Hence, stability issues are simplified to conventional second order compensation network whereby the converter can be optimized for fast transient response.
Patent Number: HK1054627A1
Application Number: HK2003106802A
Inventor: LIU JOE CHUI PONG | POON FRANKI NGAI KIT | PONG MAN HAY
Priority Date: 20 Sep 2001
Priority Number: HK1054627A1
Application Date: 22 Sep 2003
Publication Date: 27 Aug 2010
IPC Current: H02M0003335 | H02M0003337
Assignee Applicant: The University of Hong Kong
Title: METHOD AND APPARATUS FOR IMPROVING STABILITY AND DYNAMIC RESPONSE OF HALF- BRIDGE CONVERTER OF A SWITCH POWER SUPPLY
Usefulness: METHOD AND APPARATUS FOR IMPROVING STABILITY AND DYNAMIC RESPONSE OF HALF- BRIDGE CONVERTER OF A SWITCH POWER SUPPLY
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